This paper addresses various aspects on the realization of dedicated pulse-width modulation (PWM) based amplifiers for active loudspeaker systems, optimized in respect to energy consumption. A new amplifier concept, dedicated to woofer/: midrange (0-4.5-kHz) loads, has been developed. The concept is based on a novel feedback topology, a modulation strategy that is dependent of bandwidth and the use of a switching frequency as low as 44.1 kHz without compromising the sound quality. Detailed measurements on a 250-W example implementation are given. THD+N <0.1% is realized at all output powers and frequencies, and the reduction in energy consumption is around 90% compared with an equivalent conventional Class-AB amplifier.

Author: Nielsen, Karsten
Affiliation: Bang & Olufsen, Denmark and Technical University of Denmark, Lyngby, Denmark
AES Convention: 100 (May 1996) Paper Number: 4259
Publication Date: May 1, 1996
Subject: Signal Processing

Click to purchase paper as a non-member or you can login as an AES member to see more options.

No AES members have commented on this paper yet.

Subscribe to this discussion

To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.

Start a discussion!

If you would like to start a discussion about this paper and are an AES member then you can login here:
Username:
Password:

If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.